Cook said: "There are lots of wearables in this space now. The ones that are doing more than one thing, there is nothing great out there. There is nothing that is going to convince a kid that wears glasses or a band or a watch that is going to wear one."

Saying that he finds so-called 'wearables' to be "profoundly interesting" pieces of technology, Cook added: "There are a lot of things to solve in this space. It is an area for exploration. It is ripe for getting excited about. There are a lot of companies in the space."

However, he declined to comment on whether Apple would enter the market with such technology.

Cook also commented on Google Glass, saying that he is unsure whether the device has broad consumer appeal.

"I think it probably has more appeal to vertical markets," he said, later adding: "I think in terms of glasses. I wear glasses because I have to. I don't know a lot of people that wear them that don't have to. People who do wear them want them to be light and want them to be unobtrusive."

Apple is expected to officially unveil its new iOS at WWDC 2013, which gets underway on June 10.